摘要： 本文初步提出了计算机局部网络的控制结构概念和位长度系列概念。认为控制结构和拓扑结构是局部网络结构中两个逻辑上平行的子结构。位长度系列概念刻划了网络有效通信、无效通信、视在通信等过程和通信效率。利用该概念中的位长度因素及系统分解的方法,本文推导了令牌总线、令牌环的简单可比性能模型。模型表明,在大多数场合,令牌环数据吞吐能力高于令牌总线。 本文还推导丁环和总线拓扑的平均传输延迟的计算公式。

Abstract: ' Two new concepts of computer LAN. the Control Constitution and Bit Length Series are proposed, the former being a kind of structure parallel logically to, Topological .Structure. The integration of Control Constitution and Topological Structure will form a new and complete concept of LAN Structure. Bit Length Series consist of Effective, Ineffective, Viewing Bit Length and Bit Length Factor. By means of Bit Length Factor, simple data throughput models of Token Bus and Token King are deriv--ed, which indicate the throughput performance of Token Ring is higher than that of Token Bus in most cases. A formula is also derived to calculate the average transmit-low dalay time for the bus and ring.